I'm looking for mainly opinions on this thread, but also the pros and cons of these two setups.

Of course costs is the REALLY big one and which is more simplistic. Seems like you could always take the costs of an EFI system, get a decent carb and put the rest of the money towards other parts of the car.

Any opinions/info is appreciated.

Drivability is the big issue as far as I'm concerned.
The cost is the big "con".

A well set up car with a carb or two that actually RUNS WELL would be the best comparison, but many guys who have drivability problems with poor running carb setups will let their enthusiasm wane towards their car because they don't enjoy it like they should.

IMO anyways...

Top end all out power will be very close, maybe some low and midrange torque numbers would lean towards the EFI.

Cold start drivability between the two would be noticeable too IMO.

I tested a 2 barrel holley projection kit on my sbc 350 that had a decent summit cam and the other aftermarket goodies. The thing was a complete pain in the a** from the start, ran rich, and wouldn't tune well with the analog computer.

It had excellent torque response, but even while tuning it, it would stay rich. I think the biggest issue was it was an open circuit EFI and not a closed circuit with all the sensors and what not.

MPG didn't seem to change at all. If anything I swapped back to my edelbrock carb cause the EFI was putting my MPG into the ground.

I've got a megasquirt, victor efi intake, fuel injectors, pump, etc etc everything needed to put together a MPI system for my 440. But it's been sitting on the shelf for a few years now. Never got around to installing it. I've been seriously considering selling it all and just building a carb. I think I want to spend my time driving the car rather than putting the efi system together. Not that I would come out a million $ ahead, just that doing a carb would be much more doable from a time investment standpoint.

I just put the EZ-EFI system on my tunnel ram.



on the electrical side there were 2 sensor connections on the car that were not on the throttle body, water temp, and O2.

on the electrical side there was +/- and key power aside from the fuel pump.

I elected to run a new fuel system, including tank mounted pump.

Cost? I didnt have to touch the intake, just unbolt the carbs and replace - but dont just think of the cost of the carbs, you'd have to include the jet kit, air bleeds, accel pump kit, wideband O2 sensor, carb book, and the time to make all the necessary changes several times a second to get a carb anywhere near close to where these suckers run.

I can only speak to the EZ system, as it's the one I picked to go with, I didnt want to design a system ( cheaper) or map out my own fuel and timing curves ( more expensive) I wanted to control my own timing and make some adjustments, but not need a laptop to even get moving, or after a significant change in the engine.


I have about 1000 miles on it after several long car event weekends and my exhaust tips are clean, the smell does not kill you from behind the car, and i am getting better mileage...

I'd seriously consider more of these setups on my other cars.

That EZ-EFI looks nice.
I was also looking at EFI for my BB but because of the $ I bought a new 830CFM annular, mechanical secondary Speed Demon (with all replaceable jets). Using the LMI A/F meter to properly tune it, it starts better than my modern daily driver. That LMI IS the tool that s required to setup a carb. Reading plugs and other old school methods are JUST that.

i have to agree with DJV. i have been in his car with the efi and also another friend that put a single set up on his big block. holy cow, the difference in how smooth they run, the power, and drivabilty is incredible. no doubt you can get a carb close but you'll never get it dead on like injection. just way too many changing weather conditions for a carb to have a perfect mixture all the time. i'll be saving for a fast ez efi set up. those two cars made me a believer. i thought it was kinda expensive to do but the results were worth it in my opinion. i guess it depends on how much you drive your car too. someone that just cruises to local events it may not be worth going efi. but for someone like me that likes long cruises and often long cruises its definatley worth it in my opinion...

I plan on driving my 71' roadrunner all the time and probably cross country with some pro touring. Planning a future trip from down here in san antonio, texas up to augusta, maine. Big difference in climates for sure.

Can someone give me a little more info on the LMI a/f meter? Cost? Availability? How it works, etc. I can tune a carb to run decent, but I can't get it to the gnat's ass. I am having the same issue with the 800 dp Holley on my 426 as I had with the 750 sp... there's a slight stumble right off idle. I haven't tried drilling holes in the primary butterflies yet. Thanks

When I read this thread title I thought you meant fuel injection.....and I was going to tell you that injection has some driveability issues but you can get around that by using a good VST setup like Kinsler's. As for power, the max HP is about the same but there's no comparison from any point between idle and full RPM. The fuel injection is just vicious compared to a carb. But, then I realized you were talking about the kind of fuel delivery system they use on Grandma's car. Nevermind!

I was planning on going with a megasquirt multiport injection setup on my 440 Ramcharger. (DaytonaTurbo )

I think everyone has a particular set of reasons or requirements that would cause them to choose one over the other.

My list of things is:

Driveability
System feedback
Ignition control (power/cruise/economy modes)
Modern "feel"
No need to "keep in tune".

I also have to take into consideration that this truck is my daily driver and also a vehicle that will be used for camping. My current elevation is roughly 1200' AMS, and I could potentially drive in a couple of hours and be pushing close to 7000' AMS. That's not always the best circumstances for running a carb.

Has anyone used the powerjection 3 setup? It looks similar to the ez efi, but it has the ability to laptop tune as well.

I could not fir them on my tunnel ram, with EZ EFI I didnt even adjust my throttle / kickdown linkage.

they also require a laptop to make any changes... the handheld on the EZ unit makes all the changes I need.

The tunnel ram isn't an issue for me. How well does the self tuning work on either?

the EZ self tuning works excellent. The sensors monitor the engine and make the fuel delivery, which is checked by the O2, which tells the sensors to make any needed adjustments and this happens several times per second. It was cool feeling a stumble off idle diminish to a smooth running motor with bog no where!

Thanks mopar rich! I'm still learning the fuel injection systems as my experience is only with the TBI 2 barrel holley projection system on a sbc. It really had it's flaws but I don't base that experience on all systems.

I don't foresee myself making 500hp with the engine build I'm planning for this car. More in the 425hp/475lb. range is what I'm shooting for out of my 383.

I do have a complete 440 but I have my own personal reasons for not going with the 440. With the way the price of gas is going and the quality of it, I feel better with the 383. I've got a spare 383 block so I can swap out the numbers one so I can actually put my foot into without fear of breaking original numbers parts.

I looked at those parts you listed and is there a kit for a port injection setup rather than a TB setup? I looked at the last set you listed and it looks like just a wiring harness and some computer stuff. Where are the injectors on that TB setup you listed? Are they below those mini fuel rails?

Is EZ's EFI systems a closed loop system that uses sensors and what not to do self adjustments rather than having to constantly adjust an analog computer? Please forgive me on my lack of knowledge in this area as some of my questions seem to be a little repetitive.

I've got a Barry Grant 750 carb that is one of his first carbs to come out before holley sued him over his "holley look-alike". This is the alternative to using EFI. But after looking at the price of that TB setup from EZ-EFI, I'm starting to lean towards EFI. All the other kits I looked at such as the XFI kit from FAST was around $4500 and others were in the 3-3500 range in price.